@StephenOTT, do you want to correlate the message to a message start event or an intermediate message event?

In your example, the engine tries to correlate the message to all running executions + message start event of the latest version. If you want to correlate only the executions of the latest version then you have to use other correlation keys or resolve the execution ids manually. Please have a look at the reference guide.

@Philipp_Ossler, just curious on background reasons: is there any specifics on why only Deff IDs were supported any nothing like a Deff Key which defaults to the latest definition (similar to show Start instance functions)